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Date: Wed, 19 Dec 2012 20:27:28 +0100
From: Marek Kubica <marek@xivilization.net>
To: caml-list@inria.fr
Message-ID: <20121219202728.4fa184a3@xivilization.net>
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Subject: [Caml-list] OASIS: linking with C library fails

Hi,

I have got this simple example where I try to call a C funtion from
libarchive (yes, I am aware of ocaml-archive):

https://gist.github.com/c52d47cff10e4fe8af33

launcher.ml includes Archive.ml which wraps the C file Archive_stubs.c
which calls libarchive.

Unfortunately, I get an error when I try to build it, it boils down to
this:

src/launch.o: In function `camlLaunch__entry':
/home/marek/ostreamer/_build/src/launch.ml:3: undefined reference to
`ost_version_number'
src/Archive.o: In function `camlArchive':
(.data+0x10): undefined reference to `ost_version_number'
collect2: error: ld returned 1 exit status
File "caml_startup", line 1:
Error: Error during linking
Command exited with code 2.

You can see the complete output (after ocaml setup.ml -clean) in the
Gist. Now I wonder how to fix it? From what I see, Archive_stubs.c gets
compiled to an .o file properly but linking fails as it doesn't seem to
get linked to the library. What am I missing?

regards,
Marek